Question

Qual o valor de A+C+E+G na PA a seguir?

Answer 1

Encontrar a razão da PA

an = a1 + ( n -1) . r

149 = 53 + ( 9 -1) . r

149 = 53 + 8r

96 = 8r

r = 12

===

an = a1 + ( n -1) . r = an

a1 = 53 + ( 1 -1) .12 = 53

A = 53 + ( 2 -1) .12 = 65

B = 53 + ( 3 -1) .12 = 77

C = 53 + ( 4 -1) .12 = 89

D = 53 + ( 5 -1) .12 = 101

E = 53 + ( 6 -1) .12 = 113

F = 53 + ( 7 -1) .12 = 125

G = 53 + ( 8 -1) .12 = 137

a12 = 53 + ( 9 -1) .12= 149

PA = (53 , 65, 77, 89, 101, 113, 125 , 137 , 149)